Composite lumber



rPatented .lune 10, 1924.

ITED STATES BYRD C. ROCKWELL, OF CAMDE'N, ARKANSAS.

coMrosrr-n LUMBER.

Application filed April 9, 1921. Serial No. 460,059.

T all whom z'tmay concern:

Be it known that I, BYRD C. ROCKWELL, a citizen of the United States, residing at Camden, Ouachita County, Arkansas, have invented a certain new and useful Improvement in Composite Lumber, of which the followin isa full, clear, and exact description, suc as will enable others skilled in the art to which it appertains to make and use the same, reference being had to thek ac* companying drawi'n s, forming part of this application, in whic AFigure 1 and Figure 2 are detail views or one form of my invention; and,

Figure 3 is a cross sectionalview of another form thereof.

This invention relates to a new and useful improvement in composite lumbrr.- Heretofore, in joining two or more pieces of wood, the adhesive was applied to the entire surfaces of the contiguous faces so that the adhesive was present on the joined faces of the pieces glued together..- The presence of this adhesive on the faces of the composite lumber causes the discoloration or staining of the wood by the adhesive and renders the glue line conspicuous, particularly with many kinds of hardwoods. Furthermore, such glue lines come in contact with the machine knives or cutters and quickly destroy the cutting edge of the tool, and unless the tool is frequently sharpened, the contour of the article is destroyed by the uneven ed e of the tool.

he objects of this invention are To eliminate the glue lines from the' face or faces of the ,composite lumber so that the joint will not become prominent` by the presence of adhesive or by the staining or discoloration of the face of the lumber by the glue;

, side of the center line). To one side of these tongues and grooves, on one of said contigu- The composite lumberl producedl ous sides, is applied an adhesive (such as glue), as indicated at b, and the sides are clamped together in close contact while saidglue is setting. .The tongue (or groove, depending on which side the glue is applied) defines the marginal edge o f the glue line and prevents the glue from spreading and overflowing into the space on the other side of the tongue (or groove) thus insuring a free-faced article, i. e., an article having one face, say the upper, whose contiguous joined edges are free from glue.

To make a double .free-faced article, I may employ two tongues 3 and 4', as shown in Figure 3, each tongue (or groove) defining the marginal edge of the adhesive, indicated at b', and preventing its overflow. In this instance, the adhesive is confined to the center line between the contiguous sides, and both faces of the article can be planed or worked without danger of contact with the glue.

rIvhe restriction of the marginal edge of the adhesive within a definite distance from the faces of the joined articles leaves said faces free so that they can be worked without injury to the tools from coming in contact with the glue.

My improved composite lumber can be easily manufactured and advantageously used wherever a joinedface free hesive is desired.

What I claim is: l 1. Composite lumber consisting of two members, an adhesive substance applied to from adthe contiguous sides of said members and securing them together, and means for confining one of the marginal Aedges of said adhesive substance so as to leave a clear unglued face on one side of said composite lumber.

2. As a new article of manufacture, composite lumber consisting of two members, an adhesive substance applied to the contiguous sides of said members, and means for restricting the marginal edges of said adhesive substance within a definite distance from the faces of said composite lumber so as to leave said faces free from said adhesive substance.

3. Composite lumber consisting of two members, an adhesive substance applied to one of said members for lsecuring together the contiguous sides of said members, and cooperative means'formed on the contiguous sides of said members for confining the marginal' edge of said adhesive substance a presaid members, and a` groove formed on the determined distance from one of the joint contiguous side of the other one of said, 10 faces of said members. members and adapted to receive said tongue 4. Composite lumber consisting of two thereby preventing` the adhesive substance 5 members, an adhesive substance applied to from reaohingone joint face of said lumber. the contiguous sides of and securing to- In testimony whereof I hereunto affix m ether said members, there being a tongue signature this 5 da of April, 1921. ormed on the contiguous sides of one of BY D C. ROCKWELL. 

